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/*Write a SQL statement to make a list in ascending order for the customer who holds a grade less than 300 and works either
through a salesman or by own.*/
SELECT a.cust_name,,a.grade, AS "Salesman",
FROM customer a
LEFT OUTER JOIN salesman b
ON a.salesman_id=b.salesman_id
WHERE a.grade<300
ORDER BY a.customer_id;